Question

56 g of gas occupies 280 cm3 at ntp then its molecular mass is

Answer 1

Answer:

4480

Explanation:

At ntp the volume of 1 mole =22.4

1 mole = 22.4

X moles = 280 ml=0.28 (1 ml=1 c.c)

By cross multiplaction

0.28/22.4=0.0125

NUMBER OF Mole = given molecular mass/GMM

GMM=Given mass / number of moles

GMM=56/0.0125=4480

Answer 2

Answer:

4552.8 g

Explanation:

280 cm3 = 280 × 10^-3l

we know 1 mol of gas occupies 22.4 l volume at ntp

22.4l contain 1 mol

1l contain 1/22.4 mol

0.28 contain 1/22.4×0.28mol

we get 0.0125 mol

we know mol = gram w / MW

0.0125 =56/MW

MW = 4552.8 g

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